Ouster, Inc.

Limitations on Effectiveness of Controls and Procedures

Disclosure controls and procedures include controls and other procedures that are designed to ensure that information required to be disclosed in the reports filed or submitted under the Securities Exchange Act of 1934, as amended, (“Exchange Act”) is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms and that such information is accumulated and communicated to management of the Company, including its Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

In designing and evaluating our disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives. In addition, the design of disclosure controls and procedures must reflect the fact that there are resource constraints and that management is required to apply judgment in evaluating the benefits of possible controls and procedures relative to their costs.

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Interim Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures (as that term is defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of December 31, 2024. Based on that evaluation, our Chief Executive Officer and Interim Chief Financial Officer concluded that our disclosure controls and procedures were not effective as of December 31, 2024 due to the material weaknesses in our internal control over financial reporting described below.

Management’s Annual Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act). Our management, including our Chief Executive Officer and Interim Chief Financial Officer, conducted an assessment as of December 31, 2024 of the effectiveness of our internal control over financial reporting based on the criteria set forth in Internal Control–Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on this assessment, our management concluded that, as of December 31, 2024, our internal control over financial reporting was not effective due to the material weaknesses described below.

A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting such that there is a reasonable possibility that a material misstatement of our annual or interim financial statements will not be prevented or detected on a timely basis.

We did not design and maintain an effective control environment commensurate with our financial reporting requirements. Specifically, we did not maintain a sufficient complement of personnel with an appropriate degree of internal controls and accounting knowledge, experience, and training commensurate with our accounting and reporting requirements. This material weakness contributed to the following additional material weakness.

•We did not design and maintain effective controls over the period-end financial reporting process to ensure, for other than journal entries, that segregation of duties (SOD) conflicts were identified, reviewed and mitigated by appropriately designed mitigating controls as needed to achieve complete, accurate and timely financial accounting, reporting and disclosures.

The material weakness related to the control environment resulted in adjustments to several account balances and disclosures in the consolidated financial statements for the years ended December 31, 2019 and 2018, adjustments to the equity and warrant liabilities accounts and related disclosures in the unaudited condensed consolidated financial statements for the three months ended March 31, 2021, and an immaterial adjustment which was recorded prior to the issuance of the unaudited condensed consolidated financial statements as of June 30, 2024. The material weakness related to segregation of duties did not result in a material misstatement to the consolidated financial statements. Additionally, each of these material weaknesses could result in a misstatement of account balances or disclosures that would result in a material misstatement to the annual or interim consolidated financial statements that would not be prevented or detected.

Remediation Measures of Unremediated Material Weaknesses

As it relates to the above material weaknesses that continued to exist as of December 31, 2024, our management is committed and continues to make progress to improve our internal control over financial reporting. We continued implementation of a plan to remediate the control deficiencies that led to the above material weaknesses. These remediation measures are ongoing and include the following:

•Improve internal controls to ensure that segregation of duties (SOD) conflicts are timely identified, reviewed and mitigated by appropriately designed mitigating controls and procedures. This includes periodic monitoring of changes in roles and responsibilities that could impact SOD conflicts within the period-end financial reporting process.

•Continuing to recruit personnel with appropriate internal controls, accounting knowledge and experience commensurate with our accounting and reporting requirements, in addition to engaging and utilizing third party consultants and specialists. Our management also continued to reallocate and align roles and responsibilities within the accounting team to optimize and leverage the skills and experience of various personnel.

•Continuing to provide internal control training for personnel responsible for implementing internal controls for the Company.

These investments in resources have improved the stability of our accounting organization. While significant progress has been made in response to the material weaknesses, time is needed to demonstrate sustainability as it relates to our internal control over financial reporting and improvements made to our complement of resources, including demonstrating sustained operating effectiveness of our internal controls related to SOD. We are committed to continuous improvement and will continue to diligently review our internal control over financial reporting.

Remediation of Previously Reported Material Weaknesses

As previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2023, our management concluded that we did not design and maintain effective controls over the period-end financial reporting process to achieve complete, accurate and timely financial accounting, reporting and disclosures, including adequate controls related to journal entries, and verifying transactions are properly classified in the financial statements. Our management completed the following actions and measures designed to remediate the control deficiencies that led to the above material weaknesses:

•Throughout 2024, we enhanced the design and/or operation over internal controls for period end financial reporting to ensure transactions are properly classified in our financial statements, and controls related to preparation and review of journal entries. Building on the controls designed and implemented in the previous financial years, we continued to strengthen and improve these controls during 2024.

Our management completed its documentation, testing and evaluation of the enhanced control activities and determined that, as of December 31, 2024, these control activities have been appropriately designed and implemented, and have operated effectively for a sufficient period of time to conclude that these previously identified material weaknesses related to controls over the period-end financial reporting process to achieve complete, accurate and timely financial accounting, reporting and disclosures, including adequate controls related to journal entries, and verifying transactions are properly classified in the financial statements, have been remediated.

Attestation Report of Registered Public Accounting Firm

The effectiveness of our internal control over financial reporting as of December 31, 2024 was not required to be audited by our independent registered public accounting firm under Section 404(b) of the Sarbanes Oxley Act of 2002 due to Ouster being deemed a Smaller Reporting Company (SRC) within the definition of Rule 12b-2 as the company’s public float was below the specified thresholds as of June 30, 2024. Accordingly, this Annual Report on Form 10-K does not include an attestation report of our independent registered public accounting firm.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the quarter ended December 31, 2024 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.